How to change id in javascript

How to change the id in JavaScript: 1. Change the id value of the div through the byTagName method; 2. Change the id value of the div through the byId method.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to change the id in javascript?

Use JS to change the div id

By using JS, there are two ways to change the id value of the div.

1) byTagName

document.getElementsByTagName("div").id = 'id_new';

2) byId

document.getElementById("div_id").id = 'id_new';

However, in practical applications, byId is the safest way of writing and can be used at any time. ByTagName can only be used when the web page has only one div.

Recommended study: "javascript Advanced Tutorial"

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